1 /* 2 * lp5523.c - LP5523 LED Driver 3 * 4 * Copyright (C) 2010 Nokia Corporation 5 * Copyright (C) 2012 Texas Instruments 6 * 7 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> 8 * Milo(Woogyom) Kim <milo.kim@ti.com> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * version 2 as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 22 * 02110-1301 USA 23 */ 24 25 #include <linux/delay.h> 26 #include <linux/firmware.h> 27 #include <linux/i2c.h> 28 #include <linux/init.h> 29 #include <linux/leds.h> 30 #include <linux/module.h> 31 #include <linux/mutex.h> 32 #include <linux/of.h> 33 #include <linux/platform_data/leds-lp55xx.h> 34 #include <linux/slab.h> 35 36 #include "leds-lp55xx-common.h" 37 38 #define LP5523_PROGRAM_LENGTH 32 /* bytes */ 39 /* Memory is used like this: 40 0x00 engine 1 program 41 0x10 engine 2 program 42 0x20 engine 3 program 43 0x30 engine 1 muxing info 44 0x40 engine 2 muxing info 45 0x50 engine 3 muxing info 46 */ 47 #define LP5523_MAX_LEDS 9 48 49 /* Registers */ 50 #define LP5523_REG_ENABLE 0x00 51 #define LP5523_REG_OP_MODE 0x01 52 #define LP5523_REG_ENABLE_LEDS_MSB 0x04 53 #define LP5523_REG_ENABLE_LEDS_LSB 0x05 54 #define LP5523_REG_LED_PWM_BASE 0x16 55 #define LP5523_REG_LED_CURRENT_BASE 0x26 56 #define LP5523_REG_CONFIG 0x36 57 #define LP5523_REG_STATUS 0x3A 58 #define LP5523_REG_RESET 0x3D 59 #define LP5523_REG_LED_TEST_CTRL 0x41 60 #define LP5523_REG_LED_TEST_ADC 0x42 61 #define LP5523_REG_CH1_PROG_START 0x4C 62 #define LP5523_REG_CH2_PROG_START 0x4D 63 #define LP5523_REG_CH3_PROG_START 0x4E 64 #define LP5523_REG_PROG_PAGE_SEL 0x4F 65 #define LP5523_REG_PROG_MEM 0x50 66 67 /* Bit description in registers */ 68 #define LP5523_ENABLE 0x40 69 #define LP5523_AUTO_INC 0x40 70 #define LP5523_PWR_SAVE 0x20 71 #define LP5523_PWM_PWR_SAVE 0x04 72 #define LP5523_CP_AUTO 0x18 73 #define LP5523_AUTO_CLK 0x02 74 75 #define LP5523_EN_LEDTEST 0x80 76 #define LP5523_LEDTEST_DONE 0x80 77 #define LP5523_RESET 0xFF 78 #define LP5523_ADC_SHORTCIRC_LIM 80 79 #define LP5523_EXT_CLK_USED 0x08 80 #define LP5523_ENG_STATUS_MASK 0x07 81 82 /* Memory Page Selection */ 83 #define LP5523_PAGE_ENG1 0 84 #define LP5523_PAGE_ENG2 1 85 #define LP5523_PAGE_ENG3 2 86 #define LP5523_PAGE_MUX1 3 87 #define LP5523_PAGE_MUX2 4 88 #define LP5523_PAGE_MUX3 5 89 90 /* Program Memory Operations */ 91 #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */ 92 #define LP5523_MODE_ENG2_M 0x0C 93 #define LP5523_MODE_ENG3_M 0x03 94 #define LP5523_LOAD_ENG1 0x10 95 #define LP5523_LOAD_ENG2 0x04 96 #define LP5523_LOAD_ENG3 0x01 97 98 #define LP5523_ENG1_IS_LOADING(mode) \ 99 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1) 100 #define LP5523_ENG2_IS_LOADING(mode) \ 101 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2) 102 #define LP5523_ENG3_IS_LOADING(mode) \ 103 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3) 104 105 #define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */ 106 #define LP5523_EXEC_ENG2_M 0x0C 107 #define LP5523_EXEC_ENG3_M 0x03 108 #define LP5523_EXEC_M 0x3F 109 #define LP5523_RUN_ENG1 0x20 110 #define LP5523_RUN_ENG2 0x08 111 #define LP5523_RUN_ENG3 0x02 112 113 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 114 115 enum lp5523_chip_id { 116 LP5523, 117 LP55231, 118 }; 119 120 static int lp5523_init_program_engine(struct lp55xx_chip *chip); 121 122 static inline void lp5523_wait_opmode_done(void) 123 { 124 usleep_range(1000, 2000); 125 } 126 127 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current) 128 { 129 led->led_current = led_current; 130 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 131 led_current); 132 } 133 134 static int lp5523_post_init_device(struct lp55xx_chip *chip) 135 { 136 int ret; 137 138 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); 139 if (ret) 140 return ret; 141 142 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 143 usleep_range(1000, 2000); 144 145 ret = lp55xx_write(chip, LP5523_REG_CONFIG, 146 LP5523_AUTO_INC | LP5523_PWR_SAVE | 147 LP5523_CP_AUTO | LP5523_AUTO_CLK | 148 LP5523_PWM_PWR_SAVE); 149 if (ret) 150 return ret; 151 152 /* turn on all leds */ 153 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 154 if (ret) 155 return ret; 156 157 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 158 if (ret) 159 return ret; 160 161 return lp5523_init_program_engine(chip); 162 } 163 164 static void lp5523_load_engine(struct lp55xx_chip *chip) 165 { 166 enum lp55xx_engine_index idx = chip->engine_idx; 167 u8 mask[] = { 168 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 169 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 170 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 171 }; 172 173 u8 val[] = { 174 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1, 175 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2, 176 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3, 177 }; 178 179 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]); 180 181 lp5523_wait_opmode_done(); 182 } 183 184 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip) 185 { 186 enum lp55xx_engine_index idx = chip->engine_idx; 187 u8 page_sel[] = { 188 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1, 189 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2, 190 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3, 191 }; 192 193 lp5523_load_engine(chip); 194 195 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]); 196 } 197 198 static void lp5523_stop_all_engines(struct lp55xx_chip *chip) 199 { 200 lp55xx_write(chip, LP5523_REG_OP_MODE, 0); 201 lp5523_wait_opmode_done(); 202 } 203 204 static void lp5523_stop_engine(struct lp55xx_chip *chip) 205 { 206 enum lp55xx_engine_index idx = chip->engine_idx; 207 u8 mask[] = { 208 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 209 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 210 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 211 }; 212 213 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0); 214 215 lp5523_wait_opmode_done(); 216 } 217 218 static void lp5523_turn_off_channels(struct lp55xx_chip *chip) 219 { 220 int i; 221 222 for (i = 0; i < LP5523_MAX_LEDS; i++) 223 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0); 224 } 225 226 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start) 227 { 228 int ret; 229 u8 mode; 230 u8 exec; 231 232 /* stop engine */ 233 if (!start) { 234 lp5523_stop_engine(chip); 235 lp5523_turn_off_channels(chip); 236 return; 237 } 238 239 /* 240 * To run the engine, 241 * operation mode and enable register should updated at the same time 242 */ 243 244 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode); 245 if (ret) 246 return; 247 248 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec); 249 if (ret) 250 return; 251 252 /* change operation mode to RUN only when each engine is loading */ 253 if (LP5523_ENG1_IS_LOADING(mode)) { 254 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1; 255 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1; 256 } 257 258 if (LP5523_ENG2_IS_LOADING(mode)) { 259 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2; 260 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2; 261 } 262 263 if (LP5523_ENG3_IS_LOADING(mode)) { 264 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3; 265 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3; 266 } 267 268 lp55xx_write(chip, LP5523_REG_OP_MODE, mode); 269 lp5523_wait_opmode_done(); 270 271 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec); 272 } 273 274 static int lp5523_init_program_engine(struct lp55xx_chip *chip) 275 { 276 int i; 277 int j; 278 int ret; 279 u8 status; 280 /* one pattern per engine setting LED MUX start and stop addresses */ 281 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 282 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 283 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 284 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 285 }; 286 287 /* hardcode 32 bytes of memory for each engine from program memory */ 288 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00); 289 if (ret) 290 return ret; 291 292 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10); 293 if (ret) 294 return ret; 295 296 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20); 297 if (ret) 298 return ret; 299 300 /* write LED MUX address space for each engine */ 301 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 302 chip->engine_idx = i; 303 lp5523_load_engine_and_select_page(chip); 304 305 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) { 306 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j, 307 pattern[i - 1][j]); 308 if (ret) 309 goto out; 310 } 311 } 312 313 lp5523_run_engine(chip, true); 314 315 /* Let the programs run for couple of ms and check the engine status */ 316 usleep_range(3000, 6000); 317 lp55xx_read(chip, LP5523_REG_STATUS, &status); 318 status &= LP5523_ENG_STATUS_MASK; 319 320 if (status != LP5523_ENG_STATUS_MASK) { 321 dev_err(&chip->cl->dev, 322 "cound not configure LED engine, status = 0x%.2x\n", 323 status); 324 ret = -1; 325 } 326 327 out: 328 lp5523_stop_all_engines(chip); 329 return ret; 330 } 331 332 static int lp5523_update_program_memory(struct lp55xx_chip *chip, 333 const u8 *data, size_t size) 334 { 335 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 336 unsigned cmd; 337 char c[3]; 338 int nrchars; 339 int ret; 340 int offset = 0; 341 int i = 0; 342 343 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 344 /* separate sscanfs because length is working only for %s */ 345 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 346 if (ret != 1) 347 goto err; 348 349 ret = sscanf(c, "%2x", &cmd); 350 if (ret != 1) 351 goto err; 352 353 pattern[i] = (u8)cmd; 354 offset += nrchars; 355 i++; 356 } 357 358 /* Each instruction is 16bit long. Check that length is even */ 359 if (i % 2) 360 goto err; 361 362 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 363 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 364 if (ret) 365 return -EINVAL; 366 } 367 368 return size; 369 370 err: 371 dev_err(&chip->cl->dev, "wrong pattern format\n"); 372 return -EINVAL; 373 } 374 375 static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 376 { 377 const struct firmware *fw = chip->fw; 378 379 if (fw->size > LP5523_PROGRAM_LENGTH) { 380 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 381 fw->size); 382 return; 383 } 384 385 /* 386 * Program momery sequence 387 * 1) set engine mode to "LOAD" 388 * 2) write firmware data into program memory 389 */ 390 391 lp5523_load_engine_and_select_page(chip); 392 lp5523_update_program_memory(chip, fw->data, fw->size); 393 } 394 395 static ssize_t show_engine_mode(struct device *dev, 396 struct device_attribute *attr, 397 char *buf, int nr) 398 { 399 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 400 struct lp55xx_chip *chip = led->chip; 401 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 402 403 switch (mode) { 404 case LP55XX_ENGINE_RUN: 405 return sprintf(buf, "run\n"); 406 case LP55XX_ENGINE_LOAD: 407 return sprintf(buf, "load\n"); 408 case LP55XX_ENGINE_DISABLED: 409 default: 410 return sprintf(buf, "disabled\n"); 411 } 412 } 413 show_mode(1) 414 show_mode(2) 415 show_mode(3) 416 417 static ssize_t store_engine_mode(struct device *dev, 418 struct device_attribute *attr, 419 const char *buf, size_t len, int nr) 420 { 421 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 422 struct lp55xx_chip *chip = led->chip; 423 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 424 425 mutex_lock(&chip->lock); 426 427 chip->engine_idx = nr; 428 429 if (!strncmp(buf, "run", 3)) { 430 lp5523_run_engine(chip, true); 431 engine->mode = LP55XX_ENGINE_RUN; 432 } else if (!strncmp(buf, "load", 4)) { 433 lp5523_stop_engine(chip); 434 lp5523_load_engine(chip); 435 engine->mode = LP55XX_ENGINE_LOAD; 436 } else if (!strncmp(buf, "disabled", 8)) { 437 lp5523_stop_engine(chip); 438 engine->mode = LP55XX_ENGINE_DISABLED; 439 } 440 441 mutex_unlock(&chip->lock); 442 443 return len; 444 } 445 store_mode(1) 446 store_mode(2) 447 store_mode(3) 448 449 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 450 { 451 u16 tmp_mux = 0; 452 int i; 453 454 len = min_t(int, len, LP5523_MAX_LEDS); 455 456 for (i = 0; i < len; i++) { 457 switch (buf[i]) { 458 case '1': 459 tmp_mux |= (1 << i); 460 break; 461 case '0': 462 break; 463 case '\n': 464 i = len; 465 break; 466 default: 467 return -1; 468 } 469 } 470 *mux = tmp_mux; 471 472 return 0; 473 } 474 475 static void lp5523_mux_to_array(u16 led_mux, char *array) 476 { 477 int i, pos = 0; 478 for (i = 0; i < LP5523_MAX_LEDS; i++) 479 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 480 481 array[pos] = '\0'; 482 } 483 484 static ssize_t show_engine_leds(struct device *dev, 485 struct device_attribute *attr, 486 char *buf, int nr) 487 { 488 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 489 struct lp55xx_chip *chip = led->chip; 490 char mux[LP5523_MAX_LEDS + 1]; 491 492 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 493 494 return sprintf(buf, "%s\n", mux); 495 } 496 show_leds(1) 497 show_leds(2) 498 show_leds(3) 499 500 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 501 { 502 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 503 int ret; 504 u8 mux_page[] = { 505 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 506 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 507 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 508 }; 509 510 lp5523_load_engine(chip); 511 512 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 513 if (ret) 514 return ret; 515 516 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8)); 517 if (ret) 518 return ret; 519 520 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 521 if (ret) 522 return ret; 523 524 engine->led_mux = mux; 525 return 0; 526 } 527 528 static ssize_t store_engine_leds(struct device *dev, 529 struct device_attribute *attr, 530 const char *buf, size_t len, int nr) 531 { 532 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 533 struct lp55xx_chip *chip = led->chip; 534 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 535 u16 mux = 0; 536 ssize_t ret; 537 538 if (lp5523_mux_parse(buf, &mux, len)) 539 return -EINVAL; 540 541 mutex_lock(&chip->lock); 542 543 chip->engine_idx = nr; 544 ret = -EINVAL; 545 546 if (engine->mode != LP55XX_ENGINE_LOAD) 547 goto leave; 548 549 if (lp5523_load_mux(chip, mux, nr)) 550 goto leave; 551 552 ret = len; 553 leave: 554 mutex_unlock(&chip->lock); 555 return ret; 556 } 557 store_leds(1) 558 store_leds(2) 559 store_leds(3) 560 561 static ssize_t store_engine_load(struct device *dev, 562 struct device_attribute *attr, 563 const char *buf, size_t len, int nr) 564 { 565 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 566 struct lp55xx_chip *chip = led->chip; 567 int ret; 568 569 mutex_lock(&chip->lock); 570 571 chip->engine_idx = nr; 572 lp5523_load_engine_and_select_page(chip); 573 ret = lp5523_update_program_memory(chip, buf, len); 574 575 mutex_unlock(&chip->lock); 576 577 return ret; 578 } 579 store_load(1) 580 store_load(2) 581 store_load(3) 582 583 static ssize_t lp5523_selftest(struct device *dev, 584 struct device_attribute *attr, 585 char *buf) 586 { 587 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 588 struct lp55xx_chip *chip = led->chip; 589 struct lp55xx_platform_data *pdata = chip->pdata; 590 int i, ret, pos = 0; 591 u8 status, adc, vdd; 592 593 mutex_lock(&chip->lock); 594 595 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 596 if (ret < 0) 597 goto fail; 598 599 /* Check that ext clock is really in use if requested */ 600 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 601 if ((status & LP5523_EXT_CLK_USED) == 0) 602 goto fail; 603 } 604 605 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 606 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 607 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 608 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 609 if (ret < 0) 610 goto fail; 611 612 if (!(status & LP5523_LEDTEST_DONE)) 613 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 614 615 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 616 if (ret < 0) 617 goto fail; 618 619 vdd--; /* There may be some fluctuation in measurement */ 620 621 for (i = 0; i < LP5523_MAX_LEDS; i++) { 622 /* Skip non-existing channels */ 623 if (pdata->led_config[i].led_current == 0) 624 continue; 625 626 /* Set default current */ 627 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 628 pdata->led_config[i].led_current); 629 630 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff); 631 /* let current stabilize 2 - 4ms before measurements start */ 632 usleep_range(2000, 4000); 633 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 634 LP5523_EN_LEDTEST | i); 635 /* ADC conversion time is 2.7 ms typically */ 636 usleep_range(3000, 6000); 637 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 638 if (ret < 0) 639 goto fail; 640 641 if (!(status & LP5523_LEDTEST_DONE)) 642 usleep_range(3000, 6000);/* Was not ready. Wait. */ 643 644 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 645 if (ret < 0) 646 goto fail; 647 648 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 649 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 650 651 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 652 653 /* Restore current */ 654 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 655 led->led_current); 656 led++; 657 } 658 if (pos == 0) 659 pos = sprintf(buf, "OK\n"); 660 goto release_lock; 661 fail: 662 pos = sprintf(buf, "FAIL\n"); 663 664 release_lock: 665 mutex_unlock(&chip->lock); 666 667 return pos; 668 } 669 670 static void lp5523_led_brightness_work(struct work_struct *work) 671 { 672 struct lp55xx_led *led = container_of(work, struct lp55xx_led, 673 brightness_work); 674 struct lp55xx_chip *chip = led->chip; 675 676 mutex_lock(&chip->lock); 677 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 678 led->brightness); 679 mutex_unlock(&chip->lock); 680 } 681 682 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 683 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 684 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 685 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 686 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 687 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 688 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 689 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 690 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 691 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 692 693 static struct attribute *lp5523_attributes[] = { 694 &dev_attr_engine1_mode.attr, 695 &dev_attr_engine2_mode.attr, 696 &dev_attr_engine3_mode.attr, 697 &dev_attr_engine1_load.attr, 698 &dev_attr_engine2_load.attr, 699 &dev_attr_engine3_load.attr, 700 &dev_attr_engine1_leds.attr, 701 &dev_attr_engine2_leds.attr, 702 &dev_attr_engine3_leds.attr, 703 &dev_attr_selftest.attr, 704 NULL, 705 }; 706 707 static const struct attribute_group lp5523_group = { 708 .attrs = lp5523_attributes, 709 }; 710 711 /* Chip specific configurations */ 712 static struct lp55xx_device_config lp5523_cfg = { 713 .reset = { 714 .addr = LP5523_REG_RESET, 715 .val = LP5523_RESET, 716 }, 717 .enable = { 718 .addr = LP5523_REG_ENABLE, 719 .val = LP5523_ENABLE, 720 }, 721 .max_channel = LP5523_MAX_LEDS, 722 .post_init_device = lp5523_post_init_device, 723 .brightness_work_fn = lp5523_led_brightness_work, 724 .set_led_current = lp5523_set_led_current, 725 .firmware_cb = lp5523_firmware_loaded, 726 .run_engine = lp5523_run_engine, 727 .dev_attr_group = &lp5523_group, 728 }; 729 730 static int lp5523_probe(struct i2c_client *client, 731 const struct i2c_device_id *id) 732 { 733 int ret; 734 struct lp55xx_chip *chip; 735 struct lp55xx_led *led; 736 struct lp55xx_platform_data *pdata; 737 struct device_node *np = client->dev.of_node; 738 739 if (!dev_get_platdata(&client->dev)) { 740 if (np) { 741 ret = lp55xx_of_populate_pdata(&client->dev, np); 742 if (ret < 0) 743 return ret; 744 } else { 745 dev_err(&client->dev, "no platform data\n"); 746 return -EINVAL; 747 } 748 } 749 pdata = dev_get_platdata(&client->dev); 750 751 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 752 if (!chip) 753 return -ENOMEM; 754 755 led = devm_kzalloc(&client->dev, 756 sizeof(*led) * pdata->num_channels, GFP_KERNEL); 757 if (!led) 758 return -ENOMEM; 759 760 chip->cl = client; 761 chip->pdata = pdata; 762 chip->cfg = &lp5523_cfg; 763 764 mutex_init(&chip->lock); 765 766 i2c_set_clientdata(client, led); 767 768 ret = lp55xx_init_device(chip); 769 if (ret) 770 goto err_init; 771 772 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 773 774 ret = lp55xx_register_leds(led, chip); 775 if (ret) 776 goto err_register_leds; 777 778 ret = lp55xx_register_sysfs(chip); 779 if (ret) { 780 dev_err(&client->dev, "registering sysfs failed\n"); 781 goto err_register_sysfs; 782 } 783 784 return 0; 785 786 err_register_sysfs: 787 lp55xx_unregister_leds(led, chip); 788 err_register_leds: 789 lp55xx_deinit_device(chip); 790 err_init: 791 return ret; 792 } 793 794 static int lp5523_remove(struct i2c_client *client) 795 { 796 struct lp55xx_led *led = i2c_get_clientdata(client); 797 struct lp55xx_chip *chip = led->chip; 798 799 lp5523_stop_all_engines(chip); 800 lp55xx_unregister_sysfs(chip); 801 lp55xx_unregister_leds(led, chip); 802 lp55xx_deinit_device(chip); 803 804 return 0; 805 } 806 807 static const struct i2c_device_id lp5523_id[] = { 808 { "lp5523", LP5523 }, 809 { "lp55231", LP55231 }, 810 { } 811 }; 812 813 MODULE_DEVICE_TABLE(i2c, lp5523_id); 814 815 #ifdef CONFIG_OF 816 static const struct of_device_id of_lp5523_leds_match[] = { 817 { .compatible = "national,lp5523", }, 818 {}, 819 }; 820 821 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 822 #endif 823 824 static struct i2c_driver lp5523_driver = { 825 .driver = { 826 .name = "lp5523x", 827 .of_match_table = of_match_ptr(of_lp5523_leds_match), 828 }, 829 .probe = lp5523_probe, 830 .remove = lp5523_remove, 831 .id_table = lp5523_id, 832 }; 833 834 module_i2c_driver(lp5523_driver); 835 836 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 837 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 838 MODULE_DESCRIPTION("LP5523 LED engine"); 839 MODULE_LICENSE("GPL"); 840